package framework.mybatis.pageAction;
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import javax.servlet.http.HttpServletRequest;
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public class PageInfo {
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public final static String REQUEST_ATTRIBUTE_PAGE_INFO = "REQUEST_ATTRIBUTE_PAGE_INFO";
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public final static int DEFAULT_COUNT_PER_PAGE = 10;
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private int page = 1;
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private int countPerPage = DEFAULT_COUNT_PER_PAGE;
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private int totalCount;
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private int startRow;
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private int endRow;
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private int totalPage;
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protected HttpServletRequest request;
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protected PageInfo(){
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}
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/**
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* 设置总条数，计算分页参数
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*
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* @param totalCount
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* @param countPerPage
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* @param page
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*/
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public void setTotalCount(int totalCount){
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this.totalCount = totalCount;
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if (this.totalCount % this.countPerPage == 0) {
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totalPage = (int) (this.totalCount / this.countPerPage);
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} else {
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totalPage = (int) (this.totalCount / this.countPerPage) + 1;
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}
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if(totalPage==0){
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totalPage = 1;
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}
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if(this.page<1){
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this.page=1;
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}
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if(this.page>totalPage){
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this.page=totalPage;
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}
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if (this.totalCount == 0) {
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startRow=0;
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endRow=0;
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}else{
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startRow=this.countPerPage*(this.page-1)+1;
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endRow = this.countPerPage * this.page;
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endRow = endRow > this.totalCount ? this.totalCount : endRow;
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}
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//save to request
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request.setAttribute(REQUEST_ATTRIBUTE_PAGE_INFO, this);
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request.setAttribute("pageSearchStartRow", Integer.valueOf(startRow));
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}
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/**
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* 得到总页数
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* @return
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*/
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public int getTotalPage(){
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return totalPage;
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}
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/**
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* 得到当前页数
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* @return
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*/
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public int getPage() {
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return page;
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}
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/**
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* 得到每页多少条
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* @return
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*/
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public int getCountPerPage() {
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return countPerPage;
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}
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/**
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* 得到总条数
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* @return
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*/
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public int getTotalCount() {
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return totalCount;
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}
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/**
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* 得到开始的行数，从第1行开始，如果没有，则为0
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* @return
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*/
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public int getStartRow() {
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return startRow;
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}
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/**
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* 得到结束行数，从第1行开始，如果没有，则为0
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* @return
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*/
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public int getEndRow() {
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return endRow;
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}
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/**
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* 设置当前页数
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* @param page
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*/
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public void setPage(int page) {
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if(page <1){
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page = 1;
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}
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this.page = page;
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}
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/**
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* 设置每页条数
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* @param countPerPage
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*/
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public void setCountPerPage(int countPerPage) {
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if(countPerPage<1){
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countPerPage = 1;
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}
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this.countPerPage = countPerPage;
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}
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}
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